Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer

V. Gnezdilov; P. Lemmens; P. Scheib; M. Ghosh; Yu G. Pashkevich; H. Paulsen; V. Schünemann; J. A. Wolny; G. Agustí; J. A. Real

doi:10.1103/PhysRevB.79.045122

Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe²⁺ coordination polymer

V. Gnezdilov^*, P. Lemmens, P. Scheib, M. Ghosh, Yu G. Pashkevich, H. Paulsen, V. Schünemann, J. A. Wolny, G. Agustí, J. A. Real

^*Corresponding author for this work

Institute of Physics

6 Citations (Scopus)

Abstract

Raman scattering in the spin-crossover system [Fe (pmd) (H ₂O){Au(CN)₂}₂]·H₂O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin-state phases as a function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spin-state phase with an unexpected wipeout of the low-frequency phonon-scattering intensity. Furthermore we observe one phase with reduced symmetry that is attributed to a cooperative Jahn-Teller effect. Pronounced electron-phonon interaction manifests itself as a strong Fano resonance of phonons related to {FeN₆} and {FeN₄O ₂} coordination octahedra. Density-functional theory supports this interpretation.

Original language	English
Article number	045122
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	4
ISSN	1098-0121
DOIs	https://doi.org/10.1103/PhysRevB.79.045122
Publication status	Published - 05.01.2009

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Gnezdilov, V., Lemmens, P., Scheib, P., Ghosh, M., Pashkevich, Y. G., Paulsen, H., Schünemann, V., Wolny, J. A., Agustí, G., & Real, J. A. (2009). Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe²⁺ coordination polymer. Physical Review B - Condensed Matter and Materials Physics, 79(4), Article 045122. https://doi.org/10.1103/PhysRevB.79.045122

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title = "Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer",

abstract = "Raman scattering in the spin-crossover system [Fe (pmd) (H 2O)\{Au(CN)2\}2]·H2O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin-state phases as a function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spin-state phase with an unexpected wipeout of the low-frequency phonon-scattering intensity. Furthermore we observe one phase with reduced symmetry that is attributed to a cooperative Jahn-Teller effect. Pronounced electron-phonon interaction manifests itself as a strong Fano resonance of phonons related to \{FeN6\} and \{FeN4O 2\} coordination octahedra. Density-functional theory supports this interpretation.",

author = "V. Gnezdilov and P. Lemmens and P. Scheib and M. Ghosh and Pashkevich, \{Yu G.\} and H. Paulsen and V. Sch{\"u}nemann and Wolny, \{J. A.\} and G. Agust{\'i} and Real, \{J. A.\}",

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doi = "10.1103/PhysRevB.79.045122",

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T1 - Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe2+ coordination polymer

AU - Gnezdilov, V.

AU - Lemmens, P.

AU - Scheib, P.

AU - Ghosh, M.

AU - Pashkevich, Yu G.

AU - Paulsen, H.

AU - Schünemann, V.

AU - Wolny, J. A.

AU - Agustí, G.

AU - Real, J. A.

PY - 2009/1/5

Y1 - 2009/1/5

N2 - Raman scattering in the spin-crossover system [Fe (pmd) (H 2O){Au(CN)2}2]·H2O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin-state phases as a function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spin-state phase with an unexpected wipeout of the low-frequency phonon-scattering intensity. Furthermore we observe one phase with reduced symmetry that is attributed to a cooperative Jahn-Teller effect. Pronounced electron-phonon interaction manifests itself as a strong Fano resonance of phonons related to {FeN6} and {FeN4O 2} coordination octahedra. Density-functional theory supports this interpretation.

AB - Raman scattering in the spin-crossover system [Fe (pmd) (H 2O){Au(CN)2}2]·H2O reveals a complex three-phase spin-state transition in contrast to earlier observations in magnetization measurements. We observe different spin-state phases as a function of temperature and electromagnetic radiation in the visible spectral range. There exists a fluctuating spin-state phase with an unexpected wipeout of the low-frequency phonon-scattering intensity. Furthermore we observe one phase with reduced symmetry that is attributed to a cooperative Jahn-Teller effect. Pronounced electron-phonon interaction manifests itself as a strong Fano resonance of phonons related to {FeN6} and {FeN4O 2} coordination octahedra. Density-functional theory supports this interpretation.

UR - https://www.scopus.com/pages/publications/60349099057

U2 - 10.1103/PhysRevB.79.045122

DO - 10.1103/PhysRevB.79.045122

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AN - SCOPUS:60349099057

SN - 1098-0121

VL - 79

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 4

M1 - 045122

ER -

Spectrum-sensitive phonon wipeout due to a fluctuating spin state in a Fe²⁺ coordination polymer

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